Honeywell CT41A Thermostat User Manual

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CT41A  
Heating/Cooling Thermostat  
INSTALLATION INSTRUCTIONS  
MERCURY NOTICE  
If this control is replacing a control that contains  
mercury in a sealed tube, do not place your old  
control in the trash. Dispose of it properly.  
Contact your local waste management authority  
for instructions regarding recycling and the  
proper disposal of an old control.  
1
PREPARE FOR INSTALLATION  
If you are unsure about wiring procedures, please call a  
qualified service technician for assistance.  
To correctly install your new thermostat, follow these  
step-by-step instructions. It is recommended that, as  
you read, understand, and complete each step, you  
place a check mark in each box provided.  
See Your New CT41A Thermostat section above to  
determine the thermostat suitability for compatibility  
with your home system. If not, return it to the retailer.  
Acquire the required installation tools and supplies, as  
needed. See Fig. 1.  
Heating/Cooling  
1
5 to 30 Vac Thermostat  
Congratulations on the purchase of your new thermostat!  
YOUR NEW CT41A THERMOSTAT  
Your new CT41A Thermostat replaces most 15 to 30V,  
SCREWDRIVER  
4
-wire, heating/cooling system thermostats. The CT41A  
HAND OR POWER  
DRILL WITH 3/16 INCH  
DRILL BIT, IF NEEDED TO  
DRILL HOLES IN WALL  
is suitable for gas or oil heat or electric air conditioning  
systems.  
Direct questions about this thermostat to our Web site at  
www.honeywell.com/yourhome or call the customer  
information line at 1-800-468-1502.  
WIRE CUTTER/STRIPPER IF NEEDED TO STRIP WIRES  
MERCURY  
SWITCH  
LEVEL, IF NEEDED TO LEVEL  
M20551  
THERMOSTAT FOR APPEARANCE  
Fig. 1. Required installation tools/supplies.  
TYPICAL LOCATION OF A MERCURY  
SWITCH IN A THERMOSTAT  
M10614  
®
U.S. Registered Trademark  
Copyright © 2003 Honeywell International Inc •  
• All Rights  
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CT41A HEATING/COOLING THERMOSTAT  
2
REMOVE OLD THERMOSTAT  
WIRES THROUGH  
WALL OPENING  
Test to be sure your heating and air conditioning  
systems (where applicable) are working correctly. If  
not, contact your local heating/air conditioning dealer.  
To avoid compressor damage, do not operate the  
cooling system when outdoor temperature is below  
M5136  
50°F (10°C).  
Fig. 3. Wrapping wires around pencil.  
Keep the old thermostat for reference until your new  
thermostat is functioning smoothly.  
CAUTION  
Equipment Damage Hazard.  
Handling wires during installation can  
damage equipment.  
3
WIRE AND MOUNT THERMOSTAT  
Disconnect power at furnace or main breaker/  
fuse box before beginning installation.  
 Connect wires from the wall to the matching terminals  
on the back of the thermostat. See Fig. 4. Tighten the  
screws.  
Carefully unpack your new thermostat and save the  
package of screws, the instructions and the receipt.  
Remove the cover from the old thermostat. If it does  
not snap off when pulled firmly from the bottom, check  
for a screw that locks on the cover.  
NOTE: If terminal designations on old thermostat do not  
match those on new thermostat, see Table 1.  
Before removing the old thermostat from the wall, look  
at it carefully to locate the heat anticipator adjustment  
mechanism, see Fig. 2. Make a note here ________  
of the anticipator setting for future reference. The heat  
anticipator pointer, if adjustable, is set at one of a  
series of numbers representing the (electrical) current  
rating of the primary control of your system (in  
amperes). The numbers range from 0.18 to 1.0. If no  
heat anticipator/indication is showing, do not be  
concerned; move on to the next step.  
Table 1. Terminal Functions.  
New  
Thermostat  
Old Thermostat  
Terminal  
Marking  
Terminal Marking  
Function  
Fan  
G or F  
G
Y
TOP MOUNTING HOLE  
Y or C or M or Y1  
Cooling  
Heating  
Power  
(
THERMOSTAT TO WALL  
OR OUTLET BOX)  
W or H or W1  
W
ADJUSTABLE HEAT  
ANTICIPATOR  
SETTING LEVER  
RC, V, VC or B  
Your 5-wire  
system cannot  
use this  
.18  
2
.9  
.
.
7
MOUNTING CLIPS  
(FOR COVER)  
thermostat;  
use a CT87B  
instead.  
.
5
.
25  
3
FAN SWITCH  
SYSTEM SWITCH  
RH, M, VR, 4, A or  
R
Power  
R
BOTTOM  
MOUNTING HOLE  
TEMPERATURE  
SETTING LEVER  
M3782A  
Fig. 2. Locating heat anticipator adjustment  
mechanism.  
R
Loosen screws holding thermostat to subbase,  
wallplate or wall and lift away.  
W
Disconnect wires from old thermostat or subbase. As  
you disconnect each wire, tape the end and label it  
with the letter of the terminal designation. If there are  
only two wires, they do not require labeling. Wrap  
wires around a pencil to keep them from falling back  
into the wall as shown in Fig. 3.  
G
Y
TERMINAL SCREWS  
M8067A  
Fig. 4. Connect wires from wall to thermostat  
matching terminals.  
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CT41A HEATING/COOLING THERMOSTAT  
Push excess wire back into wall and plug hole with  
nonflammable insulation to prevent drafts from  
affecting thermostat operation.  
SHOWS  
VOLTAGE  
RATING  
Remove thermostat cover by pulling outward on right  
edge of cover until it snaps free of the thermostat  
base.  
V8043E 1004  
4V 50/60CY  
.32 AMP  
4
2
SHOWS  
ANTICIPATOR  
SETTING  
@
60CY  
Fasten thermostat to wall or vertical outlet box with a  
screw through the top mounting hole. See Fig. 2 for  
hole location.  
Place a bubble level or plumb line against the  
thermostat to find the level position. See Fig. 5. Start a  
screw in the center of the bottom mounting hole.  
ZONE VALVE  
OIL BURNER CONTROL  
SHOWS  
CURRENT  
DRAW  
(
Move the temperature setting lever, if necessary, to  
uncover the mounting hole.)  
SHOWS  
VOLTAGE  
VACRATING  
30  
0
.2 AMP  
BUBBLE LEVEL  
SHOWS  
VOLTAGE  
RATING  
T
T
TO  
BURNER  
F
F
24 Vac 50/60 Hz  
0.4 AMP  
FROM MAIN  
SHOWS  
FUEL SUPPLY  
ANTICIPATOR  
SETTING  
M6116B  
PLUMB  
LINE  
TYPICAL GAS VALVE  
.18  
2
.9  
.
.
7
.
5
.
25  
Fig. 6. Locate your system current draw anticipator  
setting.  
3
Set the heat anticipator indicator at the rating printed  
on the primary control. See Fig. 7.  
PLUMB  
BOB OR  
WEIGHT  
M3774  
CAUTION  
Heat Anticipator Hazard.  
Fig. 5. Level thermostat.  
Setting heat anticipator too low can cause  
anticipator burnout.  
Recheck for level positioning and firmly tighten both  
mounting screws.  
Set heat anticipator at recommended rating to  
avoid shorting out your valve or control and  
prevent burnout of your heat anticipator.  
Be sure you have the current draw anticipator setting  
for your system. This is the number you wrote in the  
box in step 2 Remove Old Thermostat section. If you  
could not find the current draw for step 2, look on your  
primary control at the furnace. See Fig. 6. (The  
primary control is usually a gas valve, zone valve, or a  
relay or burner control box with the thermostat wires  
connected to it. For electric heat, add the fan relay  
current, usually 0.2A to 0.4A.)  
SCALEPLATE  
.18  
2
.9  
.
.
7
ADJUSTABLE  
HEAT  
ANTICIPATOR  
SETTING LEVER  
.
5
.
25  
3
M3784  
Fig. 7. Set heat anticipator indicator to match your  
primary control rating.  
Press thermostat cover firmly onto the mounting clips.  
See Fig. 2.  
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CT41A HEATING/COOLING THERMOSTAT  
4
CHECK OUT THERMOSTAT  
The System switch controls as follows:  
Heat: heating system only operates.  
Off: heating and air conditioning systems are discon-  
nected.  
 Observe system operation for at least one cycle on  
both heating and air conditioning. To observe:  
 Place the System switch at the Heat position and the  
Fan switch at the Auto position. Move the temperature  
setting lever 10°F (6°C) below room temperature. The  
heating equipment should turn on. A short warmup  
period may be required before system fan turns on.  
Cool: air conditioning system only operates.  
The Fan switch controls as follows:  
Auto: fan operates when heating or air conditioning  
system operates.  
NOTE: Some systems have a time delay that can pre-  
vent operation up to five minutes.  
On: fan operates continuously.  
Turn the Fan switch to On. The system fan should turn  
on and operate continuously. The system blower  
should continue to operate at any System switch or  
thermostat setting.  
NOTE: In the following instructions, disregard heating  
or air conditioning directions if not applicable to  
your system.  
5
THERMOSTAT  
CAUTION  
Compressor Damage Hazard.  
Operating at too low of an outdoor  
temperature can cause compressor damage.  
Do not operate cooling if outdoor temperature is  
below 50°F (10°C).  
 Place the System and Fan switches at the desired  
settings for operation.  
Allow compressor to remain off for five minutes  
before restarting.  
6
TROUBLESHOOTING (TABLE 2)  
Refer to manufacturer’s recommendations.  
Your Honeywell thermostat requires little or no attention.  
Most problems can be resolved according to Table 2.  
Turn on power to the heating/air conditioning system.  
NOTE: If your system is heating-only or air  
conditioning-only, disregard sections not  
applicable to your system.  
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CT41A HEATING/COOLING THERMOSTAT  
Table 2. Recommended Corrective Action for Your System.  
Symptom  
No heat  
Problem  
Corrective Action  
Move System switch to Heat position.  
Replace fuse or reset circuit breaker.  
Turn furnace power switch to On.  
System switch is at Off of Cool position.  
Blown fuse or tripped circuit breaker.  
Furnace power switch is at Off.  
No pilot flame.  
Relight pilot flame according to furnace  
manufacturer instructions.  
Incorrect connections to thermostat.  
With power to furnace at Off, tighten all  
mounting and terminal screws. Repair frayed or  
broken wires.  
Other.  
Contact a qualified service technician for  
assistance.  
Furnace turns on and  
off.  
Burner On period is too short.  
Remove the thermostat cover and move the  
heat anticipator lever counterclockwise (left)  
one scale mark. Replace the cover and wait  
several hours for the system to stabilize.  
Major swings in  
temperature greater  
than 2°F (1°C) when  
outside temperature is  
stable.  
Burner On period is too long.  
Remove the thermostat cover and move the  
heat anticipator lever clockwise (right) one  
scale mark. Replace the cover and wait several  
hours for the system to stabilize.  
Thermostat setting and Thermostat is not level.  
Recheck the thermostat position on the wall.  
Use bubble level to make sure it is level. See  
step 3 and Fig. 5.  
thermometer reading  
disagree.  
Thermostat is affected by drafts or radiant Contact a qualified service technician to change  
heat.  
the location.  
Thermometer is out-of-calibration.  
System switch is in Off or Heat position.  
Blown fuse or tripped circuit breaker.  
Recalibrate. See step 7.  
Move switch to Cool position.  
Replace fuse or reset circuit breaker.  
Move switch to On position.  
No air conditioning.  
Compressor switch (located outdoors) is  
turned off.  
Incorrect connections to thermostat.  
Other.  
With power to system off, tighten all mounting  
and terminal screws. Repair broken wires.  
Contact service technician for assistance.  
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CT41A HEATING/COOLING THERMOSTAT  
7
RECALIBRATE THERMOMETER  
If the thermostat setpoint and the thermometer reading  
do not agree, the thermometer may need recalibration.  
BACKSIDE  
OF COVER  
Follow this procedure:  
Remove thermostat cover.  
Set the cover on a table near an accurate  
thermometer.  
THERMOMETER  
SHAFT  
After allowing five or ten minutes for stabilization,  
compare the readings.  
If the readings are the same, replace the cover and  
put the system into operation.  
If the readings are different, insert a hex head wrench  
into the thermostat shaft and turn it until the  
thermometers have the same reading. See Fig. 8.  
Replace cover and put the system into operation.  
HEX HEAD  
WRENCH  
M8068  
Fig. 8. Adjusting thermometer calibration.  
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CT41A HEATING/COOLING THERMOSTAT  
Limited One-Year Warranty  
Honeywell warrants this product, excluding battery, to be free from defects in the workmanship or materials, under normal use and service, for a period of  
one (1) year from the date of purchase by the consumer. If, at any time during the warranty period, the product is defective or malfunctions, Honeywell shall  
repair or replace it (at Honeywell’s option) within a reasonable period of time.  
If the product is defective,  
(
(
i) return it, with a bill of sale or other dated proof of purchase, to the retailer from which you purchased it, or  
ii) package it carefully, along with proof of purchase (including date of purchase) and a short description of the malfunction, and mail it, postage prepaid,  
to the following address:  
Honeywell Return Goods  
Dock 4, MN10-3860  
Canada: Honeywell Limited/Honeywell Limitée  
Product Services ON15  
1
885 Douglas Dr N  
35 Dynamic Dr  
Golden Valley, MN 55422  
Scarborough, Ontario M1V 4Z9  
This warranty does not cover removal or reinstallation costs. This warranty shall not apply if it is shown by Honeywell that the defect or malfunction was  
caused by damage which occurred while the product was in the possession of a consumer.  
Honeywell’s sole responsibility shall be to repair or replace the product within the terms stated above. HONEYWELL SHALL NOT BE LIABLE FOR ANY  
LOSS OR DAMAGE OF ANY KIND, INCLUDING ANY INCIDENTAL OR CONSEQUENTIAL DAMAGES RESULTING, DIRECTLY OR INDIRECTLY,  
FROM ANY BREACH OF ANY WARRANTY, EXPRESS OR IMPLIED, OR ANY OTHER FAILURE OF THIS PRODUCT. Some states do not allow the  
exclusion or limitation of incidental or consequential damages, so this limitation may not apply to you.  
THIS WARRANTY IS THE ONLY EXPRESS WARRANTY HONEYWELL MAKES ON THIS PRODUCT. THE DURATION OF ANY IMPLIED  
WARRANTIES, INCLUDING THE WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, IS HEREBY LIMITED TO  
THE ONE YEAR DURATION OF THIS WARRANTY. Some states do not allow limitations on how long an implied warranty lasts, so the above limitation  
may not apply to you.  
This warranty gives you specific legal rights, and you may have other rights which vary from state to state.  
If you have any questions concerning this warranty, please write Honeywell Customer Relations, 1985 Douglas Dr N, MN10-1461, Golden Valley, MN  
55422. In Canada, write Retail Products ON15, Honeywell Limited/Honeywell Limitée, 35 Dynamic Dr, Scarborough, Ontario M1V 4Z9.  
7
69-0788-2  
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CT41A HEATING/COOLING THERMOSTAT  
Automation and Control Solutions  
Honeywell International Inc.  
Honeywell Limited-Honeywell Limitée  
35 Dynamic Drive  
Scarborough, Ontario  
M1V 4Z9  
1
985 Douglas Drive North  
Golden Valley, MN 55422  
Printed in U.S.A. on recycled  
paper containing at least 10%  
post-consumer paper fibers.  
69-0788—2 G.H. Rev. 10-03  
www.honeywell.com/yourhome  

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